Nickel nanoparticles obtained by a modified polyol process: Synthesis, characterization, and magnetic properties

Couto, Giselle Giovanna do; Klein, João J.; Schreiner, W. H.; Mosca, D. H.; Oliveira, A. J. A. de; Zarbin, Aldo J. G.

doi:10.1016/j.jcis.2007.03.045

Cited by 226 publications

(129 citation statements)

References 30 publications

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“…The C=O stretch red shifts from pure PVP to 1601 cm −1 as nickel is protected with PVP and continues to shift to pure nickel at 1586 cm −1 [28]. Another region to evaluate is the peaks between 1170 and 1270 cm −1 , which signify the C-N stretch in PVP [28].…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Nickel and Nickel Hydroxide Nanopowders by Simplified Chemical Reduction

Tientong

Garcia

Thurber

et al. 2014

Journal of Nanotechnology

108

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Nickel nanopowders were synthesized by a chemical reduction of nickel ions with hydrazine hydrate at pH ∼12.5. Sonication of the solutions created a temperature of 54-65 ∘ C to activate the reduction reaction of nickel nanoparticles. The solution pH affected the composition of the resulting nanoparticles. Nickel hydroxide nanoparticles were formed from an alkaline solution (pH∼10) of nickel-hydrazine complexed by dropwise titration. X-ray diffraction of the powder and the analysis of the resulting Williamson-Hall plots revealed that the particle size of the powders ranged from 12 to 14 nm. Addition of polyvinylpyrrolidone into the synthesis decreased the nickel nanoparticle size to approximately 7 nm. Dynamic light scattering and scanning electron microscopy confirmed that the particles were in the nanometer range. The structure of the synthesized nickel and nickel hydroxide nanoparticles was identified by X-ray diffraction and Fourier transform infrared spectroscopy.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Nickel and Nickel Hydroxide Nanopowders by Simplified Chemical Reduction

Tientong

Garcia

Thurber

et al. 2014

Journal of Nanotechnology

108

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“…Over the past decade the polyol process has been used to synthesize metallic nanoparticles such as Pt [132,133], Pd [88,134], Au [135], Fe [136], Ni [137,138], Co [139], Ag [140,141], Cu [142,143], Sn [144], and Rh [73]. Platinum is one of the most active metal catalysts toward many electrochemical reactions, such as oxidation of small molecules and reduction of molecular oxygen in PEMFC.…”

Section: Orr Activity On Various Carbon Supported Nanoparticles Prepamentioning

confidence: 99%

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

et al. 2015

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Abstract:The oxygen reduction reaction (ORR) is the oldest studied and most challenging of the electrochemical reactions. Due to its sluggish kinetics, ORR became the major contemporary technological hurdle for electrochemists, as it hampers the commercialization of fuel cell (FC) technologies. Downsizing the metal particles to nanoscale introduces unexpected fundamental modifications compared to the corresponding bulk state. To address these fundamental issues, various synthetic routes have been developed in order to provide more versatile carbon-supported low platinum catalysts. Consequently, the approach of using nanocatalysts may overcome the drawbacks encountered in massive materials for energy conversion. This review paper aims at summarizing the recent important advances in carbon-supported metal nanoparticles preparation from colloidal methods (microemulsion, polyol, impregnation, Bromide Anion Exchange…) as cathode material in low temperature FCs. Special attention is devoted to the correlation of the structure of the nanoparticles and their catalytic properties. The influence of the synthesis method on the electrochemical properties of the resulting catalysts is also discussed. Emphasis on analyzing data from theoretical models to address the intrinsic and specific electrocatalytic properties, depending on the synthetic method, is incorporated throughout. The synthesis process-nanomaterials structure-catalytic activity relationships highlighted herein, provide ample new rational, convenient and OPEN ACCESSCatalysts 2015, 5 311 straightforward strategies and guidelines toward more effective nanomaterials design for energy conversion.

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“…This is because when the alloy is generated, Pd interacts with the Ni atoms withdrawing some electronic density from them (due to its higher electronegativity) thus generating electron deficient Ni species. In addition, there is some degree of interaction between the Ni nanoparticles and the PVP polymer, that would have the same effect on the metal surface as the Pd-PVP interaction [33,36]. Some metal oxidation due to air contact must be also taken into account.…”

Section: Nanoparticles Characterizationmentioning

confidence: 99%

Single wall carbon nanotubes loaded with Pd and NiPd nanoparticles for H2 sensing at room temperature

García-Aguilar

Miguel-García

Berenguer-Murcia

et al. 2014

Carbon

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Pd and bimetallic Ni 50 Pd 50 nanoparticles protected by polyvinylpyrrolidone (PVP) have been synthesized by the reduction-by-solvent method and deposited on single wall carbon nanotubes (SWCNTs) to be tested as H 2 sensors. The SWCNTs were deposited by drop casting from different suspensions. The Pd nanoparticles-based sensors show a very reproducible performance with good sensitivity and very low response times (few seconds) for different H 2 concentrations, ranging from 0.2 to 5 % vol. H 2 in air at atmospheric pressure. The influence of the metal nanoparticle composition, the quality of SWCNTs suspension and the metal loading have been studied, observing that all these parameters play an important role in the H 2 sensor performance. Evidence for water formation during the H 2 detection on Pd nanoparticles has been found, and its repercussion on the behaviour of the assembled sensors is discussed.The sensor preparation procedure detailed in this work has proven to be simple and reproducible to prepare cost-effective and highly efficient H 2 sensors that perform very well under real application conditions. * Corresponding author. Fax: +34 965 903454 E-mail: a.berenguer@ua.es (Á. Berenguer-Murcia) 2 1. Introduction.

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Nickel nanoparticles obtained by a modified polyol process: Synthesis, characterization, and magnetic properties

Cited by 226 publications

References 30 publications

Synthesis of Nickel and Nickel Hydroxide Nanopowders by Simplified Chemical Reduction

Synthesis of Nickel and Nickel Hydroxide Nanopowders by Simplified Chemical Reduction

Recent Advances in Carbon Supported Metal Nanoparticles Preparation for Oxygen Reduction Reaction in Low Temperature Fuel Cells

Single wall carbon nanotubes loaded with Pd and NiPd nanoparticles for H2 sensing at room temperature

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